In more than 20 years LDN gained a superior expertise in the detection of small molecules, especially biogenic amines and neurotransmitter.

This expertise enables us to offer a broad range of highly specific immunoassays for small molecules covering multiple pathways linked to neuroscience and neuroendocrine tumors. We offer immunoassays for the quantitative detection of the catecholamines epinephrine, norepinephrin and dopamine as well as for their metabolites metanephrine, normetanephrine and 3-metoxytyramine. In the serotonergic pathway, we offer immunoassays for L-tryptophan, serotonin (5-HT) and 5-hydroxyindoleacetic acid (5-HIAA).

Further downstream the serotonergic pathway LDN offers immunoassays for the detection of melatonin. In the serotonin metabolism we offer an immunoassay for the quantitative detection of L-kynurenine. The combination of the measurement of serotonin, L-tryptophan and L-kynurenine offers an excellent way for neuroscientists to monitor the activity of the enzyme indolamin 2,3-dioxygenase 1 (IDO1). The neurotransmitters histamine, GABA and glutamate are completing the outstanding portfolio of immunoassays for offered by LDN not only for neuroscience. Almost all of the immunoassays are available as both, CE IVD marked kits for clinical routine testing or as research use only kits offering a broader range of accepted sample types and species.

In addition, LDN offers an exhaustive portfolio of immunoassays for the endocrinology, thyroid function, androgen assessment, fertility and reproduction, tumor markers, the disease marker c-reactive protein (CRP) and salivary and veterinary steroid testing. Besides immunoassays for clinical applications and research we are offering AOAC approved assays for the detection of histamine in food, especially in seafood.

We are striving to expand our portfolio and research and development is one of our major projects.

The comprehensive product portfolio in combination with our greatest asset, the employees, is the foundation of our successful business in more than 60 countries across the globe.



State-of-the-art immunoassays for the analysis of biogenic amines and their derivatives, neurotransmitters, and amino acids


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State-of-the-art immunoassays for the analysis of biogenic amines and their derivatives, neurotransmitters, and amino acids


Flexible research ELISAs for the quantification of minute amounts of analytes in various biological liquids